Parkinson’s disease a neurodegenerative disorder can be manifested with mild cognitive impairment. Clinically, it is often misdiagnosed as Parkinson’s disease with neuropsychiatric complication which may be treated with neuroleptics and results in progression of the disease. We report a case of 60 year old female who is already diagnosed as Parkinson’s disease presenting with sleep disturbances and abnormal behaviour. Patient improved with administration of dopamine facilitator amantadine.